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I also have found the Nikon 180mm F2.8 to be very good. It seems to have a flat field and the stars are ok even in the corners. It does show some CA but thanks to Greg's advice I can easily eliminate this.
I have also used a few old Olympus OM lenses and the results have been very good although only in Ha monochrome so far. The 50mm F1.4 and 135mm F2.8 have been the best performers. You can get them on ebay for very cheap prices.
A friend has made me an adapter to mount my Minolta/Sony lenses on to a QHY9 and QHY8L and I am testing these now.
My best results so far have been from an old Nikon E Series 100mm F2.8 lens. It is very small and light. The stars are points across the whole frame and it seems to show very little CA. This was an under $100 ebay bargain.
However, the absolute best quality widefield astro photos I have seen have come from a friend's Canon 200mm F2.8L lens on his original Canon 5D.
Ross.
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